I am currently creating my first Python game using pygame and have now come across something that baffles me so I would appreciate your help.
In the current statues of the game, all that there is on the screen is an image of a space ship over a white background (gameDisplay.fill(white)) that can only move up and down, located at the left side of the screen. When clicking on the space bar, the space ship shoots two laser beams (or basically creates two thin rects that move from left to right, changing x position but keeping the y position so that the movement would be only horizontal).
The problem that I have is that instead of moving from left to right, it seems as though the 'lasers' stretch out to the right, so that the left side of the rect stays near the space ship image on the left of the screen while the right side of the rect moves to toward the right side of the screen.
As shown in the image below:
After playing around with the problem, I found that if I use an image as a background instead of filling the background with the color white, everything works as it should.
In the image below you can see how it looks when I use a plain white picture as a background image (Using bg = pygame.image.load("img\white_background.png" and then blitting it inside the game loop before all other drawings):
I currently have 4 files that make up the game:
1 main.py:
import time
import pygame
from first_game.game_loop import game_loop
from first_game.space_ship import space_ship
pygame.init()
display_width = 800
display_height = 600
colors = {
'black':(0, 0, 0),
'white':(255, 255, 255),
'red':(255, 0, 0)
}
gameDisplay = pygame.display.set_mode((display_width, display_height))
pygame.display.set_caption('First game')
clock = pygame.time.Clock()
gameDisplay.fill(colors['white'])
player = space_ship("img\\space_ship.png","player",103,103)
game_loop(gameDisplay,display_width,display_height,clock, player, bg)
2 game_loop.py:
import pygame
import first_game.methods
def game_loop(gameDisplay, display_width, display_height, clock, space_ship, bg):
space_ship_x = (display_width * 0.05)
space_ship_y = (display_height * 0.45)
space_ship_y_change = 0
both_laser_x = 0
top_laser_y = 0
bottom_laser_y = 0
both_laser_width = 50
both_laser_height = 5
laser_speed = 15
laser_adjustment_x = 70
laser_adjustment_y = 18
laser_fired = False
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP:
space_ship_y_change = -5
if event.key == pygame.K_DOWN:
space_ship_y_change = 5
if event.key == pygame.K_SPACE:
top_laser_y = space_ship_y + laser_adjustment_y
bottom_laser_y = space_ship_y + space_ship.height - laser_adjustment_y
both_laser_x = space_ship_x + space_ship.width - laser_adjustment_x
laser_fired = True
if event.type == pygame.KEYUP:
if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
space_ship_y_change = 0
if both_laser_x>display_width:
laser_fired=False
first_game.methods.space_ship(space_ship.img_location, space_ship_x, space_ship_y, gameDisplay)
if laser_fired == True:
first_game.methods.laser(gameDisplay,both_laser_x, top_laser_y,bottom_laser_y,both_laser_width,both_laser_height)
both_laser_x += laser_speed
if space_ship_y == -20:
if space_ship_y_change<0:
space_ship_y_change=0
if space_ship_y+space_ship.height>=display_height+20:
if space_ship_y_change>0:
space_ship_y_change=0
space_ship_y = space_ship_y + space_ship_y_change
pygame.display.update()
clock.tick(60)
3 methods.py:
def space_ship(space_ship_location, x, y, gameDisplay):
space_ship_img = pygame.image.load(space_ship_location)
gameDisplay.blit(space_ship_img, (x, y))
def laser(gameDisplay,x,y1,y2,w,h):
pygame.draw.rect(gameDisplay, (255,0,0), [x, y1, w, h])
pygame.draw.rect(gameDisplay, (255,0,0), [x, y2, w, h])
4 space_ship.py
class space_ship():
def __init__(self,img_location, type, width, height):
self.img_location = img_location
self.type = type
self.width = width
self.height = height
